Emmons hamlin



@ui-tch tetrs utent @ffice- LcttersvPatent No.

iurnovsnsm 1N MELDEONS, e0.

ill-Ln flgehule. refont to in these Enters ntcnt mit mating prut of itt 5mm.-

To ALL when I'r MAY CoNonnN: L t

Be it-known that I, EMMONS HAMLIN, of Winchester', in the county of vund of Massiv chusetts, have invented nn Improvement in Melodeons, Ste.; endl do hereby declare .that the following, taken in connection with the drawings which accompany and form part ot' ,this speciliczition, is o. description of my inveution'sulhcient to enable those skilled in the nrt to practise it. u I' In that c lnssiofmelo'deo-ns or reed musical instruments ineach wheels'for interrupting the current of oir in its passage yto or from ythe reeds, iii lsuch manner as `to 'produce tremulous pulsations, such tremolo-attachinent.- being opertedibythe bellows, and it is custbmary to connect the reciprocating bellows-board with a pedal, which closes the bellows, the inflation of the bellows being eected by a. spring which is compressedin and by the act of closing the bellows,'while the bellows-bonrds are spreadby the stressof the spring.

An objection to' this construction is a. want of uniformity in thei trcm'olo', because, when the bellows is wholly closed, the spring acts'(as the movable board begins to vOpern) with its full power of renction, while, as the board approaches its outermostposition, the force of the spring'decreascs, and the speed ofthe tremolo-valve or wheel is correspondingly decreasell To remedy this defect vis the object of my improvement, and my 'invention consists in combining with a bellows and tremble-attachment, n regulator-gate or valve, operated by the bellows, *this regulator cnusingthe orice for entrance of air toenlai-ge as the stress or intensity of the bellows-spring decreases, and thus effecting a uniform action in the tremolo. A 'f The' drawing .represents those parts` of n inelodeon immediately connected with and embodying my improvement. v l V A shows n vertical section through the-bellows und lever-pin.

B is a. plan showing the regulator-lever, and other mechanism.

C is a cross-section through the lower pnrtof. the wheel-box and the upper p ert of the bellows.

a denotes the wind-chest; I, the reedbourd; c, one of. the reeds; (l, the exhaust-bellows; e,' the movable bonrd thereof, expansion of the bellows cxhnusting'or tending to exhaust air from the wind-chest, through airpassages f, and vthus causing air to rush through the reeds c to supply the vacuum. Over the wind-chest is a wheel-box, g, containing a windwheel, h, mounted upon an axle, z'.- At one end of the wheel-box, said box communicates with the wind-chest a through a passage, k, and at its opposite end it has a. passage, l, lending t0 -the atmosphere, and as air is exhausted from the wind-chest by the bellows, nir rushes into the passage l, and

the current of air thus created betweenthe two passages l; l, impinging upon the blades of the wheel z, imparts rotation thereto, as will be readify understood.

O n the axle z' is a tremolo-wheel, m., so situated relatively to the reeds, that by its rotation it interrupts the current oit-nir, producing pulsations of the same, which impart. the tremulous sound to the air drawn through lthe reeds., this wheel being actuated by the wind-wheel L.

' The air-inlet Z of the wheel-box g is controlled by u gate or slidefviilreg'u, and this vulve is jointed to a lever, o, which turns on a fncruin, p, und is actuated by o. pin, g, projecting u p from the reciprocating bellowsboard e, through the wind-chest and through a slot, r, in the reed-board 11. Movement to nndi'ro ofthe bellowsboard, and the eonsequentmovelncnt of, the'pin g, causes suid pin'to roch the lever o, undsuch movement ofthe lever causes the gate orvalve n to slide int'o andfrom, or in. and out, withinthe air-inlet Z o f the windu-heel box, or in such manner as to cause the air-passage to alternately ccntractnnd enlnrge accordingly as the bellows is contracted or intl-cited, the operation being as follows: When the bellows is Contracted by the pedal, the vulve er 'gate 11, thrown iu by thelerer 0, as shown :it B, the passage s through the valve and into the box q being thus contracted toits ininumnm area. when the bellows is released from the pressure of the pedal, it is immediately subjected to the full expansive power or stress of the spring, and the impetus of the lcurrent ot of which the air' is drawn through the reeds by an exhaust-bcllows, there are now used, to a considerable extent, tremolo-attnchments, or 'treinolo-valve'sor air against the wheel, and through this contracted passage, drives the wheel. Now, as the bellows expands, the pin q throws in the end of the lever o, to which it is connected, which throws out the opposite end of the lever, and with it the valve or gate n, thus enlarging the valve-opening and wind-passage into the wheel-box, which thereby becomes of maximum capacity, as'the bellows is fully expanded, and the stress of the spring is least intense, and hyt'nis means the wind-wheel and tremolo-wheel nre driven at uniform speed, the intensity of the impinging current, when the bellows is under the full expansive power of its spring, being counterbalanced by the ,enlarged volume of impin-ging air, when the spring has nearly spent its power.

vI claim, in combination with a tremolo-attachment and an exhaust-bellows, a regulator-valve or gate, operating substantially ns and for the purpose set forth.

EMMONS HAMLIN.

Witnesses:

J. B. CROSBY, 'FRANCIS GoULD 

